@article{MZ_1977__153_172501,
     author = {J\'on K. Arason and A. Pfister},
     title = {Zur {Theorie} der quadratischen {Formen} \"uber formalreellen {K\"orpern.}},
     journal = {Mathematische Zeitschrift},
     pages = {289--296},
     publisher = {mathdoc},
     volume = {153},
     year = {1977},
     zbl = {0354.12021},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__153_172501/}
}